No screws or adhesives needed. I needed a way to attach my IKEA Rill casters to the legs on my IKEA Lack table without damaging the table.

The casters slide right in and lock in place due to the sag in the layer above the slot. Not intentional but that worked in my favour.

I used tree supports as they came off better.
I printed it with the caster side down.

As a happy accident, the overhang on the front of the spot where the caster slides in sags just enough to lock the caster into the part after sliding it in.